It’s street-theatre-but-not-as-we-know-it in which the performers are disguised threads in the very real tapestry of a busy city thoroughfare and we, be-headphoned on raked seating, are the ones on display to be ignored or gawked at by passers-by. Via our ears though, the familiar urban scene becomes a movie replete with evocative score, and its cast of thousands is quickly narrowed down to four protagonists. Locating them isn’t easy, and it’s part of the game, but their story is as surprising and compelling as any thriller